माटो र जग – Soil Mechanics & Foundation MCQ
माटो र जग – सिभिल इन्जिनियरिङ
Soil Mechanics & Foundation · Civil Engineering · ४०८ प्रश्न
४०८ प्रश्न उपलब्ध। मोड छान्नुहोस्:
माटो र जग: प्रश्न र उत्तर
सही लागेको विकल्पमा थिच्नुहोस्। सही भए हरियो, गलत भए रातो देखिन्छ; ३ सेकेन्डपछि सही उत्तर र व्याख्या देखिन्छ।
सही: ० / ०
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The Hiley formula is used to estimate the:
सही उत्तर: ग) Load carrying capacity of a driven pile from driving data
Hiley's is a dynamic pile formula relating hammer energy and set per blow to pile capacity.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pneumatic caisson differs from an open caisson in that:
सही उत्तर: क) Its working chamber is kept under compressed air to keep water out
Compressed air in the working chamber balances water pressure so workers can excavate in the dry; a box caisson is the one closed at the bottom.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In a well foundation, the masonry or concrete wall of the well that transfers load to the cutting edge and helps the well sink is called the:
सही उत्तर: घ) Steining
The steining is the main wall of the well; the curb sits above the cutting edge, and the bottom plug seals the base.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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Inclined piles provided mainly to resist large lateral (horizontal) loads are called:
सही उत्तर: घ) Batter (raker) piles
Batter piles are driven at an inclination so that part of their axial capacity resists horizontal loads.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The efficiency of a pile group is defined as the ratio of:
सही उत्तर: ग) Ultimate load of the group to the sum of ultimate loads of individual piles
ηg = Qg(ult)/(n × Qu of single pile); it is often less than 1 for friction piles in clay.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A pile 0.5 m in diameter and 10 m long is embedded in clay with cu = 50 kPa. Taking adhesion factor α = 0.5, the ultimate skin friction is about:
सही उत्तर: क) 393 kN
Qs = α·cu·As = 0.5 × 50 × (π × 0.5 × 10) = 25 × 15.71 ≈ 393 kN.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A bored pile of 0.5 m diameter has its base in clay with undrained cohesion 50 kPa. Using Qb = 9·cu·Ab, the ultimate end bearing is about:
सही उत्तर: घ) 88 kN
Ab = π × 0.5²/4 = 0.196 m²; Qb = 9 × 50 × 0.196 ≈ 88 kN.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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In expansive black cotton soil, a layer placed below foundations to reduce swelling effects is the:
सही उत्तर: घ) Cohesive non-swelling (CNS) layer
A CNS soil layer (about 0.6–1 m) resists the swelling pressure of the black cotton soil and reduces heave.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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A floating (compensated) foundation reduces net pressure on the soil by:
सही उत्तर: क) Excavating soil whose weight nearly equals the weight of the building
Removing soil of weight close to the structure's load (e.g. by basements) makes the net increase in stress, and hence settlement, small.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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The safe (allowable) bearing pressure for design of a footing is taken as the lower of the values governed by:
सही उत्तर: ख) Shear failure (with factor of safety) and permissible settlement
Allowable bearing pressure must satisfy both safety against shear failure and the permissible settlement criterion.
💬 टिप्पणी / गल्ती रिपोर्ट (०)
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